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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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DSP56362P 数据表(PDF) 50 Page - Freescale Semiconductor, Inc |
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DSP56362P 数据表(HTML) 50 Page - Freescale Semiconductor, Inc |
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50 / 152 page  External Memory Expansion Port (Port A) DSP56362 Technical Data, Rev. 4 3-24 Freescale Semiconductor Table 3-12 DRAM Page Mode Timings, Four Wait States 100 and 120MHz1, 2, 3, 4 No. Characteristics Symbol Expression 100 MHz 120 MHz Unit Min Max Min Max 131 Page mode cycle time for two consecutive accesses of the same direction Page mode cycle time for mixed (read and write) accesses. tPC 5 × T C 4.5 × TC 50.0 45.0 — — 41.7 37.5 ns 132 CAS assertion to data valid (read) tCAC 100 MHz: 2.75 × T C − 7.0 — 20.5 — 15.9 ns 133 Column address valid to data valid (read) tAA 100 MHz: 3.75 × T C − 7.0 — 30.5 — 24.2 ns 134 CAS deassertion to data not valid (read hold time) tOFF 0.0 — 0.0 — ns 135 Last CAS assertion to RAS deassertion tRSH 3.5 × T C − 4.0 31.0 — 25.2 — ns 136 Previous CAS deassertion to RAS deassertion tRHCP 6 × T C − 4.0 56.0 — 46.0 — ns 137 CAS assertion pulse width tCAS 2.5 × T C − 4.0 21.0 — 16.8 — ns 138 Last CAS deassertion to RAS assertion5 BRW[1:0] = 00 BRW[1:0] = 01 BRW[1:0] = 10 BRW[1:0] = 11 tCRP 2.75 × T C − 6.0 4.25 × T C − 6.0 5.25 × T C − 6.0 7.25 × T C − 6.0 — — 46.5 66.5 — — — — — — 37.7 54.4 — — — — ns 139 CAS deassertion pulse width tCP 2 × T C − 4.0 16.0 — 12.7 — ns 140 Column address valid to CAS assertion tASC TC − 4.0 6.0 — 4.3 — ns 141 CAS assertion to column address not valid tCAH 3.5 × T C − 4.0 31.0 — 25.2 — ns 142 Last column address valid to RAS deassertion tRAL 5 × T C − 4.0 46.0 — 37.7 — ns 143 WR deassertion to CAS assertion tRCS 100 MHz: 1.25 × T C − 4.0 8.5 — 6.4 — ns 144 CAS deassertion to WR assertion tRCH 100 MHz: 1.25 × T C − 4.0 8.5 — 6.4 — ns 145 CAS assertion to WR deassertion tWCH 3.25 × T C − 4.2 28.3 — 22.9 — ns 146 WR assertion pulse width tWP 4.5 × T C − 4.5 40.5 — 33.0 — ns 147 Last WR assertion to RAS deassertion tRWL 4.75 × T C − 4.3 43.2 — 35.3 — ns 148 WR assertion to CAS deassertion tCWL 3.75 × T C − 4.3 33.2 — 26.9 — ns |
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